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class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_1-检察日期是否有效" class="sidebar-link">1. 检察日期是否有效</a></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_2-计算两个日期之间的间隔" class="sidebar-link">2. 计算两个日期之间的间隔</a></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_3-查找日期位于一年中的第几天" class="sidebar-link">3. 查找日期位于一年中的第几天</a></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_4-时间格式化" class="sidebar-link">4. 时间格式化</a></li></ul></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#二、字符串处理" class="sidebar-link">二、字符串处理</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_1-字符串首字母大写" class="sidebar-link">1. 字符串首字母大写</a></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_2-翻转字符串" class="sidebar-link">2. 翻转字符串</a></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_3-随机字符串" class="sidebar-link">3. 随机字符串</a></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_4-截断字符串" class="sidebar-link">4. 截断字符串</a></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_5-去除字符串中的html" class="sidebar-link">5. 去除字符串中的HTML</a></li></ul></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#三、数组处理" class="sidebar-link">三、数组处理</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_1-从数组中移除重复项" class="sidebar-link">1. 从数组中移除重复项</a></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_2-判断数组是否为空" class="sidebar-link">2. 判断数组是否为空</a></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_3-合并两个数组" class="sidebar-link">3. 合并两个数组</a></li></ul></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#四、数字操作" class="sidebar-link">四、数字操作</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_1-判断一个数是奇数还是偶数" class="sidebar-link">1. 判断一个数是奇数还是偶数</a></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_2-获得一组数的平均值" class="sidebar-link">2. 获得一组数的平均值</a></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_3-获取两个整数之间的随机整数" class="sidebar-link">3. 获取两个整数之间的随机整数</a></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_4-指定位数四舍五入" class="sidebar-link">4. 指定位数四舍五入</a></li></ul></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#五、颜色操作" class="sidebar-link">五、颜色操作</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_1-将rgb转化为十六机制" class="sidebar-link">1. 将RGB转化为十六机制</a></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_2-获取随机十六进制颜色" class="sidebar-link">2. 获取随机十六进制颜色</a></li></ul></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#六、浏览器操作" class="sidebar-link">六、浏览器操作</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_1-复制内容到剪切板" class="sidebar-link">1. 复制内容到剪切板</a></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_2-清除所有cookie" class="sidebar-link">2. 清除所有cookie</a></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_3-获取选中的文本" class="sidebar-link">3. 获取选中的文本</a></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_4-检测是否是黑暗模式" class="sidebar-link">4. 检测是否是黑暗模式</a></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_5-滚动到页面顶部" class="sidebar-link">5. 滚动到页面顶部</a></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_6-判断当前标签页是否激活" class="sidebar-link">6. 判断当前标签页是否激活</a></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_7-判断当前是否是苹果设备" class="sidebar-link">7. 判断当前是否是苹果设备</a></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_8-是否滚动到页面底部" class="sidebar-link">8. 是否滚动到页面底部</a></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_9-重定向到一个url" class="sidebar-link">9. 重定向到一个URL</a></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_10-打开浏览器打印框" class="sidebar-link">10. 打开浏览器打印框</a></li></ul></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#七、其他操作" class="sidebar-link">七、其他操作</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_1-随机布尔值" class="sidebar-link">1. 随机布尔值</a></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_2-变量交换" class="sidebar-link">2. 变量交换</a></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_3-获取变量的类型" class="sidebar-link">3. 获取变量的类型</a></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_4-华氏度和摄氏度之间的转化" class="sidebar-link">4. 华氏度和摄氏度之间的转化</a></li><li class="sidebar-sub-header"><a href="/blog/pages/a61298/#_5-检测对象是否为空" class="sidebar-link">5. 检测对象是否为空</a></li></ul></li></ul></li><li><a href="/blog/pages/8143cc480faf9a11/" class="sidebar-link">new命令原理</a></li><li><a href="/blog/pages/b1af5cb8996363c5/" class="sidebar-link">ES5面向对象</a></li><li><a href="/blog/pages/1f4123be6f45abcd/" class="sidebar-link">ES6面向对象</a></li><li><a href="/blog/pages/e808fba1fa8fbab2/" class="sidebar-link">多种数组去重性能对比</a></li><li><a href="/blog/pages/40b4db2d38ba85f2/" class="sidebar-link">JS随机打乱数组</a></li><li><a href="/blog/pages/40f623be692cf8bc/" class="sidebar-link">判断是否为移动端浏览器</a></li><li><a href="/blog/pages/f1acb712033ac8da/" class="sidebar-link">将一维数组按指定长度转为二维数组</a></li><li><a href="/blog/pages/0f6a0ac99b62ede5/" class="sidebar-link">防抖与节流函数</a></li><li><a href="/blog/pages/7a91be2d502346ce/" class="sidebar-link">JS获取和修改url参数</a></li><li><a href="/blog/pages/fd4a16d56b83c1bc/" class="sidebar-link">比typeof运算符更准确的类型判断</a></li><li><section class="sidebar-group collapsable is-sub-group depth-1"><p class="sidebar-heading"><span>三级目录</span> <span class="arrow right"></span></p> <!----></section></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>学习笔记</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <div><main class="page"><div class="theme-vdoing-wrapper "><div class="articleInfo-wrap" data-v-0c557b5e><div class="articleInfo" data-v-0c557b5e><ul class="breadcrumbs" data-v-0c557b5e><li data-v-0c557b5e><a href="/blog/" title="首页" class="iconfont icon-home router-link-active" data-v-0c557b5e></a></li> <li data-v-0c557b5e><a href="/blog/web/#前端" data-v-0c557b5e>前端</a></li><li data-v-0c557b5e><a href="/blog/web/#JavaScript文章" data-v-0c557b5e>JavaScript文章</a></li></ul> <div class="info" data-v-0c557b5e><div title="作者" class="author iconfont icon-touxiang" data-v-0c557b5e><a href="javascript:;" data-v-0c557b5e>CUGGZ</a></div> <div title="创建时间" class="date iconfont icon-riqi" data-v-0c557b5e><a href="javascript:;" data-v-0c557b5e>2021-11-02</a></div> <!----></div></div></div> <!----> <div class="content-wrapper"><div class="right-menu-wrapper"><div class="right-menu-margin"><div class="right-menu-content"></div></div></div> <h1><img src="">33个非常实用的JavaScript一行代码<!----></h1>  <div class="theme-vdoing-content content__default"><h2 id="一、日期处理"><a href="#一、日期处理" class="header-anchor">#</a> 一、日期处理</h2> <h3 id="_1-检察日期是否有效"><a href="#_1-检察日期是否有效" class="header-anchor">#</a> 1. 检察日期是否有效</h3> <p>该方法用于检测给出的日期是否有效：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">isDateValid</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter"><span class="token operator">...</span>val</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token operator">!</span>Number<span class="token punctuation">.</span><span class="token function">isNaN</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">(</span><span class="token operator">...</span>val<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">valueOf</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token function">isDateValid</span><span class="token punctuation">(</span><span class="token string">&quot;December 17, 1995 03:24:00&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>  <span class="token comment">// true</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h3 id="_2-计算两个日期之间的间隔"><a href="#_2-计算两个日期之间的间隔" class="header-anchor">#</a> 2. 计算两个日期之间的间隔</h3> <p>该方法用于计算两个日期之间的间隔时间：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">dayDif</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">date1<span class="token punctuation">,</span> date2</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> Math<span class="token punctuation">.</span><span class="token function">ceil</span><span class="token punctuation">(</span>Math<span class="token punctuation">.</span><span class="token function">abs</span><span class="token punctuation">(</span>date1<span class="token punctuation">.</span><span class="token function">getTime</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">-</span> date2<span class="token punctuation">.</span><span class="token function">getTime</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token operator">/</span> <span class="token number">86400000</span><span class="token punctuation">)</span>

<span class="token function">dayDif</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">(</span><span class="token string">&quot;2021-11-3&quot;</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">(</span><span class="token string">&quot;2022-2-1&quot;</span><span class="token punctuation">)</span><span class="token punctuation">)</span>  <span class="token comment">// 90</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p>距离过年还有90天~</p> <h3 id="_3-查找日期位于一年中的第几天"><a href="#_3-查找日期位于一年中的第几天" class="header-anchor">#</a> 3. 查找日期位于一年中的第几天</h3> <p>该方法用于检测给出的日期位于今年的第几天：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">dayOfYear</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">date</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> Math<span class="token punctuation">.</span><span class="token function">floor</span><span class="token punctuation">(</span><span class="token punctuation">(</span>date <span class="token operator">-</span> <span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">(</span>date<span class="token punctuation">.</span><span class="token function">getFullYear</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token operator">/</span> <span class="token number">1000</span> <span class="token operator">/</span> <span class="token number">60</span> <span class="token operator">/</span> <span class="token number">60</span> <span class="token operator">/</span> <span class="token number">24</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token function">dayOfYear</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>   <span class="token comment">// 307</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p>2021年已经过去300多天了~</p> <h3 id="_4-时间格式化"><a href="#_4-时间格式化" class="header-anchor">#</a> 4. 时间格式化</h3> <p>该方法可以用于将时间转化为hour:minutes:seconds的格式：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">timeFromDate</span> <span class="token operator">=</span> <span class="token parameter">date</span> <span class="token operator">=&gt;</span> date<span class="token punctuation">.</span><span class="token function">toTimeString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">8</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token function">timeFromDate</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">(</span><span class="token number">2021</span><span class="token punctuation">,</span> <span class="token number">11</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">12</span><span class="token punctuation">,</span> <span class="token number">30</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>  <span class="token comment">// 12:30:00</span>
<span class="token function">timeFromDate</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>  <span class="token comment">// 返回当前时间 09:00:00</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><h2 id="二、字符串处理"><a href="#二、字符串处理" class="header-anchor">#</a> 二、字符串处理</h2> <h3 id="_1-字符串首字母大写"><a href="#_1-字符串首字母大写" class="header-anchor">#</a> 1. 字符串首字母大写</h3> <p>该方法用于将英文字符串的首字母大写处理：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">capitalize</span> <span class="token operator">=</span> <span class="token parameter">str</span> <span class="token operator">=&gt;</span> str<span class="token punctuation">.</span><span class="token function">charAt</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toUpperCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> str<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span>

<span class="token function">capitalize</span><span class="token punctuation">(</span><span class="token string">&quot;hello world&quot;</span><span class="token punctuation">)</span>  <span class="token comment">// Hello world</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h3 id="_2-翻转字符串"><a href="#_2-翻转字符串" class="header-anchor">#</a> 2. 翻转字符串</h3> <p>该方法用于将一个字符串进行翻转操作，返回翻转后的字符串：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">reverse</span> <span class="token operator">=</span> <span class="token parameter">str</span> <span class="token operator">=&gt;</span> str<span class="token punctuation">.</span><span class="token function">split</span><span class="token punctuation">(</span><span class="token string">''</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">reverse</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token string">''</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token function">reverse</span><span class="token punctuation">(</span><span class="token string">'hello world'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>   <span class="token comment">// 'dlrow olleh'</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h3 id="_3-随机字符串"><a href="#_3-随机字符串" class="header-anchor">#</a> 3. 随机字符串</h3> <p>该方法用于生成一个随机的字符串：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">randomString</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> Math<span class="token punctuation">.</span><span class="token function">random</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token number">36</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token function">randomString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h3 id="_4-截断字符串"><a href="#_4-截断字符串" class="header-anchor">#</a> 4. 截断字符串</h3> <p>该方法可以从指定长度处截断字符串:</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">truncateString</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">string<span class="token punctuation">,</span> length</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> string<span class="token punctuation">.</span>length <span class="token operator">&lt;</span> length <span class="token operator">?</span> string <span class="token operator">:</span> <span class="token template-string"><span class="token template-punctuation string">`</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>string<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> length <span class="token operator">-</span> <span class="token number">3</span><span class="token punctuation">)</span><span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">...</span><span class="token template-punctuation string">`</span></span><span class="token punctuation">;</span>

<span class="token function">truncateString</span><span class="token punctuation">(</span><span class="token string">'Hi, I should be truncated because I am too loooong!'</span><span class="token punctuation">,</span> <span class="token number">36</span><span class="token punctuation">)</span>   <span class="token comment">// 'Hi, I should be truncated because...'</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h3 id="_5-去除字符串中的html"><a href="#_5-去除字符串中的html" class="header-anchor">#</a> 5. 去除字符串中的HTML</h3> <p>该方法用于去除字符串中的HTML元素：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">stripHtml</span> <span class="token operator">=</span> <span class="token parameter">html</span> <span class="token operator">=&gt;</span> <span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">DOMParser</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">parseFromString</span><span class="token punctuation">(</span>html<span class="token punctuation">,</span> <span class="token string">'text/html'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span>body<span class="token punctuation">.</span>textContent <span class="token operator">||</span> <span class="token string">''</span><span class="token punctuation">;</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><h2 id="三、数组处理"><a href="#三、数组处理" class="header-anchor">#</a> 三、数组处理</h2> <h3 id="_1-从数组中移除重复项"><a href="#_1-从数组中移除重复项" class="header-anchor">#</a> 1. 从数组中移除重复项</h3> <p>该方法用于移除数组中的重复项：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">removeDuplicates</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">arr</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">[</span><span class="token operator">...</span><span class="token keyword">new</span> <span class="token class-name">Set</span><span class="token punctuation">(</span>arr<span class="token punctuation">)</span><span class="token punctuation">]</span><span class="token punctuation">;</span>

console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token function">removeDuplicates</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">,</span> <span class="token number">6</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h3 id="_2-判断数组是否为空"><a href="#_2-判断数组是否为空" class="header-anchor">#</a> 2. 判断数组是否为空</h3> <p>该方法用于判断一个数组是否为空数组，它将返回一个布尔值：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">isNotEmpty</span> <span class="token operator">=</span> <span class="token parameter">arr</span> <span class="token operator">=&gt;</span> Array<span class="token punctuation">.</span><span class="token function">isArray</span><span class="token punctuation">(</span>arr<span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span> arr<span class="token punctuation">.</span>length <span class="token operator">&gt;</span> <span class="token number">0</span><span class="token punctuation">;</span>

<span class="token function">isNotEmpty</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>  <span class="token comment">// true</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h3 id="_3-合并两个数组"><a href="#_3-合并两个数组" class="header-anchor">#</a> 3. 合并两个数组</h3> <p>可以使用下面两个方法来合并两个数组：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">merge</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">a<span class="token punctuation">,</span> b</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> a<span class="token punctuation">.</span><span class="token function">concat</span><span class="token punctuation">(</span>b<span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token keyword">const</span> <span class="token function-variable function">merge</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">a<span class="token punctuation">,</span> b</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">[</span><span class="token operator">...</span>a<span class="token punctuation">,</span> <span class="token operator">...</span>b<span class="token punctuation">]</span><span class="token punctuation">;</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h2 id="四、数字操作"><a href="#四、数字操作" class="header-anchor">#</a> 四、数字操作</h2> <h3 id="_1-判断一个数是奇数还是偶数"><a href="#_1-判断一个数是奇数还是偶数" class="header-anchor">#</a> 1. 判断一个数是奇数还是偶数</h3> <p>该方法用于判断一个数字是奇数还是偶数：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">isEven</span> <span class="token operator">=</span> <span class="token parameter">num</span> <span class="token operator">=&gt;</span> num <span class="token operator">%</span> <span class="token number">2</span> <span class="token operator">===</span> <span class="token number">0</span><span class="token punctuation">;</span>

<span class="token function">isEven</span><span class="token punctuation">(</span><span class="token number">996</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h3 id="_2-获得一组数的平均值"><a href="#_2-获得一组数的平均值" class="header-anchor">#</a> 2. 获得一组数的平均值</h3> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">average</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter"><span class="token operator">...</span>args</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> args<span class="token punctuation">.</span><span class="token function">reduce</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">a<span class="token punctuation">,</span> b</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> a <span class="token operator">+</span> b<span class="token punctuation">)</span> <span class="token operator">/</span> args<span class="token punctuation">.</span>length<span class="token punctuation">;</span>

<span class="token function">average</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">)</span><span class="token punctuation">;</span>   <span class="token comment">// 3</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h3 id="_3-获取两个整数之间的随机整数"><a href="#_3-获取两个整数之间的随机整数" class="header-anchor">#</a> 3. 获取两个整数之间的随机整数</h3> <p>该方法用于获取两个整数之间的随机整数</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">random</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">min<span class="token punctuation">,</span> max</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> Math<span class="token punctuation">.</span><span class="token function">floor</span><span class="token punctuation">(</span>Math<span class="token punctuation">.</span><span class="token function">random</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">*</span> <span class="token punctuation">(</span>max <span class="token operator">-</span> min <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token operator">+</span> min<span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token function">random</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">50</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h3 id="_4-指定位数四舍五入"><a href="#_4-指定位数四舍五入" class="header-anchor">#</a> 4. 指定位数四舍五入</h3> <p>该方法用于将一个数字按照指定位进行四舍五入：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">round</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">n<span class="token punctuation">,</span> d</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token function">Number</span><span class="token punctuation">(</span>Math<span class="token punctuation">.</span><span class="token function">round</span><span class="token punctuation">(</span>n <span class="token operator">+</span> <span class="token string">&quot;e&quot;</span> <span class="token operator">+</span> d<span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">&quot;e-&quot;</span> <span class="token operator">+</span> d<span class="token punctuation">)</span>

<span class="token function">round</span><span class="token punctuation">(</span><span class="token number">1.005</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">)</span> <span class="token comment">//1.01</span>
<span class="token function">round</span><span class="token punctuation">(</span><span class="token number">1.555</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">)</span> <span class="token comment">//1.56</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><h2 id="五、颜色操作"><a href="#五、颜色操作" class="header-anchor">#</a> 五、颜色操作</h2> <h3 id="_1-将rgb转化为十六机制"><a href="#_1-将rgb转化为十六机制" class="header-anchor">#</a> 1. 将RGB转化为十六机制</h3> <p>该方法可以将一个RGB的颜色值转化为16进制值：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">rgbToHex</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">r<span class="token punctuation">,</span> g<span class="token punctuation">,</span> b</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token string">&quot;#&quot;</span> <span class="token operator">+</span> <span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token number">1</span> <span class="token operator">&lt;&lt;</span> <span class="token number">24</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token punctuation">(</span>r <span class="token operator">&lt;&lt;</span> <span class="token number">16</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token punctuation">(</span>g <span class="token operator">&lt;&lt;</span> <span class="token number">8</span><span class="token punctuation">)</span> <span class="token operator">+</span> b<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token number">16</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token function">rgbToHex</span><span class="token punctuation">(</span><span class="token number">255</span><span class="token punctuation">,</span> <span class="token number">255</span><span class="token punctuation">,</span> <span class="token number">255</span><span class="token punctuation">)</span><span class="token punctuation">;</span>  <span class="token comment">// '#ffffff'</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h3 id="_2-获取随机十六进制颜色"><a href="#_2-获取随机十六进制颜色" class="header-anchor">#</a> 2. 获取随机十六进制颜色</h3> <p>该方法用于获取一个随机的十六进制颜色值：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">randomHex</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">#</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>Math<span class="token punctuation">.</span><span class="token function">floor</span><span class="token punctuation">(</span>Math<span class="token punctuation">.</span><span class="token function">random</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">*</span> <span class="token number">0xffffff</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token number">16</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">padEnd</span><span class="token punctuation">(</span><span class="token number">6</span><span class="token punctuation">,</span> <span class="token string">&quot;0&quot;</span><span class="token punctuation">)</span><span class="token interpolation-punctuation punctuation">}</span></span><span class="token template-punctuation string">`</span></span><span class="token punctuation">;</span>

<span class="token function">randomHex</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h2 id="六、浏览器操作"><a href="#六、浏览器操作" class="header-anchor">#</a> 六、浏览器操作</h2> <h3 id="_1-复制内容到剪切板"><a href="#_1-复制内容到剪切板" class="header-anchor">#</a> 1. 复制内容到剪切板</h3> <p>该方法使用 navigator.clipboard.writeText 来实现将文本复制到剪贴板：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">copyToClipboard</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">text</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> navigator<span class="token punctuation">.</span>clipboard<span class="token punctuation">.</span><span class="token function">writeText</span><span class="token punctuation">(</span>text<span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token function">copyToClipboard</span><span class="token punctuation">(</span><span class="token string">&quot;Hello World&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h3 id="_2-清除所有cookie"><a href="#_2-清除所有cookie" class="header-anchor">#</a> 2. 清除所有cookie</h3> <p>该方法可以通过使用 document.cookie 来访问 cookie 并清除存储在网页中的所有 cookie：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> clearCookies <span class="token operator">=</span> document<span class="token punctuation">.</span>cookie<span class="token punctuation">.</span><span class="token function">split</span><span class="token punctuation">(</span><span class="token string">';'</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token parameter">cookie</span> <span class="token operator">=&gt;</span> document<span class="token punctuation">.</span>cookie <span class="token operator">=</span> cookie<span class="token punctuation">.</span><span class="token function">replace</span><span class="token punctuation">(</span><span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">^ +</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">,</span> <span class="token string">''</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">replace</span><span class="token punctuation">(</span><span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">=.*</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">,</span> <span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">=;expires=</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span><span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toUTCString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">;path=/</span><span class="token template-punctuation string">`</span></span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><h3 id="_3-获取选中的文本"><a href="#_3-获取选中的文本" class="header-anchor">#</a> 3. 获取选中的文本</h3> <p>该方法通过内置的 getSelection 属性获取用户选择的文本：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">getSelectedText</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> window<span class="token punctuation">.</span><span class="token function">getSelection</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token function">getSelectedText</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h3 id="_4-检测是否是黑暗模式"><a href="#_4-检测是否是黑暗模式" class="header-anchor">#</a> 4. 检测是否是黑暗模式</h3> <p>该方法用于检测当前的环境是否是黑暗模式，它是一个布尔值：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> isDarkMode <span class="token operator">=</span> window<span class="token punctuation">.</span>matchMedia <span class="token operator">&amp;&amp;</span> window<span class="token punctuation">.</span><span class="token function">matchMedia</span><span class="token punctuation">(</span><span class="token string">'(prefers-color-scheme: dark)'</span><span class="token punctuation">)</span><span class="token punctuation">.</span>matches

console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>isDarkMode<span class="token punctuation">)</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h3 id="_5-滚动到页面顶部"><a href="#_5-滚动到页面顶部" class="header-anchor">#</a> 5. 滚动到页面顶部</h3> <p>该方法用于在页面中返回顶部：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">goToTop</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> window<span class="token punctuation">.</span><span class="token function">scrollTo</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token function">goToTop</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h3 id="_6-判断当前标签页是否激活"><a href="#_6-判断当前标签页是否激活" class="header-anchor">#</a> 6. 判断当前标签页是否激活</h3> <p>该方法用于检测当前标签页是否已经激活：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">isTabInView</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token operator">!</span>document<span class="token punctuation">.</span>hidden<span class="token punctuation">;</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><h3 id="_7-判断当前是否是苹果设备"><a href="#_7-判断当前是否是苹果设备" class="header-anchor">#</a> 7. 判断当前是否是苹果设备</h3> <p>该方法用于检测当前的设备是否是苹果的设备：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">isAppleDevice</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">Mac|iPod|iPhone|iPad</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span>navigator<span class="token punctuation">.</span>platform<span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token function">isAppleDevice</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h3 id="_8-是否滚动到页面底部"><a href="#_8-是否滚动到页面底部" class="header-anchor">#</a> 8. 是否滚动到页面底部</h3> <p>该方法用于判断页面是否已经底部：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">scrolledToBottom</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> document<span class="token punctuation">.</span>documentElement<span class="token punctuation">.</span>clientHeight <span class="token operator">+</span> window<span class="token punctuation">.</span>scrollY <span class="token operator">&gt;=</span> document<span class="token punctuation">.</span>documentElement<span class="token punctuation">.</span>scrollHeight<span class="token punctuation">;</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><h3 id="_9-重定向到一个url"><a href="#_9-重定向到一个url" class="header-anchor">#</a> 9. 重定向到一个URL</h3> <p>该方法用于重定向到一个新的URL：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">redirect</span> <span class="token operator">=</span> <span class="token parameter">url</span> <span class="token operator">=&gt;</span> location<span class="token punctuation">.</span>href <span class="token operator">=</span> url

<span class="token function">redirect</span><span class="token punctuation">(</span><span class="token string">&quot;https://www.google.com/&quot;</span><span class="token punctuation">)</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h3 id="_10-打开浏览器打印框"><a href="#_10-打开浏览器打印框" class="header-anchor">#</a> 10. 打开浏览器打印框</h3> <p>该方法用于打开浏览器的打印框：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">showPrintDialog</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> window<span class="token punctuation">.</span><span class="token function">print</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><h2 id="七、其他操作"><a href="#七、其他操作" class="header-anchor">#</a> 七、其他操作</h2> <h3 id="_1-随机布尔值"><a href="#_1-随机布尔值" class="header-anchor">#</a> 1. 随机布尔值</h3> <p>该方法可以返回一个随机的布尔值，使用Math.random()可以获得0-1的随机数，与0.5进行比较，就有一半的概率获得真值或者假值。</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">randomBoolean</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> Math<span class="token punctuation">.</span><span class="token function">random</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&gt;=</span> <span class="token number">0.5</span><span class="token punctuation">;</span>

<span class="token function">randomBoolean</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h3 id="_2-变量交换"><a href="#_2-变量交换" class="header-anchor">#</a> 2. 变量交换</h3> <p>可以使用以下形式在不适用第三个变量的情况下，交换两个变量的值：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token punctuation">[</span>foo<span class="token punctuation">,</span> bar<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token punctuation">[</span>bar<span class="token punctuation">,</span> foo<span class="token punctuation">]</span><span class="token punctuation">;</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><h3 id="_3-获取变量的类型"><a href="#_3-获取变量的类型" class="header-anchor">#</a> 3. 获取变量的类型</h3> <p>该方法用于获取一个变量的类型：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">trueTypeOf</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">obj</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token class-name">Object</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span><span class="token number">8</span><span class="token punctuation">,</span> <span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toLowerCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token function">trueTypeOf</span><span class="token punctuation">(</span><span class="token string">''</span><span class="token punctuation">)</span><span class="token punctuation">;</span>     <span class="token comment">// string</span>
<span class="token function">trueTypeOf</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>      <span class="token comment">// number</span>
<span class="token function">trueTypeOf</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>       <span class="token comment">// undefined</span>
<span class="token function">trueTypeOf</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">;</span>   <span class="token comment">// null</span>
<span class="token function">trueTypeOf</span><span class="token punctuation">(</span><span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>     <span class="token comment">// object</span>
<span class="token function">trueTypeOf</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>     <span class="token comment">// array</span>
<span class="token function">trueTypeOf</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>      <span class="token comment">// number</span>
<span class="token function">trueTypeOf</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>  <span class="token comment">// function</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br></div></div><h3 id="_4-华氏度和摄氏度之间的转化"><a href="#_4-华氏度和摄氏度之间的转化" class="header-anchor">#</a> 4. 华氏度和摄氏度之间的转化</h3> <p>该方法用于摄氏度和华氏度之间的转化：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">celsiusToFahrenheit</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">celsius</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> celsius <span class="token operator">*</span> <span class="token number">9</span><span class="token operator">/</span><span class="token number">5</span> <span class="token operator">+</span> <span class="token number">32</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> <span class="token function-variable function">fahrenheitToCelsius</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">fahrenheit</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">(</span>fahrenheit <span class="token operator">-</span> <span class="token number">32</span><span class="token punctuation">)</span> <span class="token operator">*</span> <span class="token number">5</span><span class="token operator">/</span><span class="token number">9</span><span class="token punctuation">;</span>

<span class="token function">celsiusToFahrenheit</span><span class="token punctuation">(</span><span class="token number">15</span><span class="token punctuation">)</span><span class="token punctuation">;</span>    <span class="token comment">// 59</span>
<span class="token function">celsiusToFahrenheit</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>     <span class="token comment">// 32</span>
<span class="token function">celsiusToFahrenheit</span><span class="token punctuation">(</span><span class="token operator">-</span><span class="token number">20</span><span class="token punctuation">)</span><span class="token punctuation">;</span>   <span class="token comment">// -4</span>
<span class="token function">fahrenheitToCelsius</span><span class="token punctuation">(</span><span class="token number">59</span><span class="token punctuation">)</span><span class="token punctuation">;</span>    <span class="token comment">// 15</span>
<span class="token function">fahrenheitToCelsius</span><span class="token punctuation">(</span><span class="token number">32</span><span class="token punctuation">)</span><span class="token punctuation">;</span>    <span class="token comment">// 0</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><h3 id="_5-检测对象是否为空"><a href="#_5-检测对象是否为空" class="header-anchor">#</a> 5. 检测对象是否为空</h3> <p>该方法用于检测一个JavaScript对象是否为空：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">isEmpty</span> <span class="token operator">=</span> <span class="token parameter">obj</span> <span class="token operator">=&gt;</span> Reflect<span class="token punctuation">.</span><span class="token function">ownKeys</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span><span class="token punctuation">.</span>length <span class="token operator">===</span> <span class="token number">0</span> <span class="token operator">&amp;&amp;</span> obj<span class="token punctuation">.</span>constructor <span class="token operator">===</span> Object<span class="token punctuation">;</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><blockquote><p>作者：CUGGZ
链接：https://juejin.cn/post/7025771605422768159</p></blockquote></div></div>  <div class="page-edit"><div class="edit-link"><a href="https://github.com/xugaoyi/vuepress-theme-vdoing/edit/master/docs/01.前端/25.JavaScript文章/01.33个非常实用的JavaScript一行代码.md" target="_blank" rel="noopener noreferrer">编辑</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <div class="tags"><a href="/blog/tags/?tag=JavaScript" title="标签">#JavaScript</a></div> <div class="last-updated"><span class="prefix">上次更新:</span> <span class="time">2022/01/18, 12:59:48</span></div></div> <div class="page-nav-wapper"><div class="page-nav-centre-wrap"><!----> <a href="/blog/pages/8143cc480faf9a11/" class="page-nav-centre page-nav-centre-next"><div class="tooltip">new命令原理</div></a></div> <div class="page-nav"><p class="inner"><!----> <span class="next"><a href="/blog/pages/8143cc480faf9a11/">new命令原理</a>→
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